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This genus of four species is recognised by the presence of a forewing appendix. This is an entirely membranous area at the wingtip which is not bisected by any veins. The species are very similar; identification is complicated by the existence of different colour forms and ideally requires dissection of the male sternal apodemes (song apparatus).
A. albostriatella is a common species found on Pedunculate Oak Quercus robur across the UK. There are usually dark spots at the bases of the tibial spines. A. viridis is extremely similar but is associated with Sessile Oak Quercus petraea.
Adult: June to October
Length 3.5-4.5 mm
|Adult female (form typica): London (August 2008) ©Tristan Bantock
|Adult female (form discicollis): London (June 2008) ©Tristan Bantock
||Adult female (form discicollis): London (July 2008) ©Tristan Bantock
|Adult female (form discicollis): London (July 2008) ©Tristan Bantock
||Adult: London (June 2008) ©Tristan Bantock